Ultracet是一种镇痛药(含acetaminophen, tramadol hydrochloride)ultraadj.超；过激的；极端的n.过激论者；急进论者ultrabasic rocks超碱岩ultramafic rocks超镁铁岩ultrafine yttria超细氧化钇ultrasonotherapy超声(波)疗法ultrasound knife超声刀ultra thin laser超薄激光器ultrahigh myopia超高度近视ultrastuc-ture超微结构ultra acelerator超催化剂ultra-distance超远距离